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Preparation of a soluble polysilsesquioxane containing a macrocyclic structure and capture of palladium ions

Abstract

In this study, a soluble polysilsesquioxane containing a macrocyclic structure (PSQ-MC) was successfully prepared by the hydrolytic condensation of a dual site-type silane coupling agent, i.e., bis{3-[3-(trimethoxysilyl)propylthio]propyl}phthalate (BTPP), using hydrochloric acid as the catalyst in an acetone/ethyl acetate mixed solvent. Based on the results of 29Si NMR and gel permeation chromatography and the fact that the dimer of the cyclized BTPP was present in the intermediate after the reaction of BTPP in a dilute solution at room temperature, PSQ-MC was assumed to be a polymer in which an 8-membered cyclic siloxane with two 23-membered rings was linked by a single siloxane bond. In addition, PSQ-MC was able to capture palladium ions.

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Acknowledgement

We acknowledge the support of Prof. Y. Suda, Dr. M. Wakao, and Dr. H. Shinchi of the Graduate School of Science and Engineering, Kagoshima University (Japan) for the MALDI-TOF MS measurements.

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Conflict of interest

The authors declare that they have no conflict of interest.

Correspondence to Yoshiro Kaneko.

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